John veenon ptjgh



fig gm fi wf/ J V. PUGH. SPOKE ronwmn sroxnn WHEELS. APPLICATION FILED MAY 12, 1908.

907,282. Patented Dec.22,1908.

' ibnuvnnuoiv PUGH, or COVENTRY, ENGLAND.

SPOKE FOR WIRE-SPOKED WHEELS.

Specification of Letters Patent.

Patented Dec. 22, 1908.

Application and na ia, 1908. Serial No. 432,553.

lo atl whom itmdy concern. i

Be it known that 1, JOHN VERNON PUGH,

subject of the. King of Great Britain-and Ireland, and residing at Budge Works, Crow Lane, Coventry, in the county of l/Varwick, England, have invented certain new and useful Improvements in and Relating to Spokes for 4 Wire-Spoked Wheels,- of which the following is a s ecification.

This invention re ates to improvements in \vlre spokes and is' especially applicable to wheels having wire spokes which are slightly set at the ends to engage in holes set to about to the face of the spoke flange. In spokes of this character, the center line of the straight portion of the spoke passes considerably beyond the. intersection of the' center line of the bent portion withthe center line of the bearingsurface inthe flange. As the result of experiment and practice itis found that while such spokes possess an increased ultimate strength over spokes bent in the usual way to about 90, and are more advantageous in resisting the efi'ects of repeatedly applied stresses, yet they are not entirely satisfactory in this respect.

The object of the present-invention is to produce a' spoke having in addition to the advantage which results from the sli ht .set or bend above referred to, the additional advantage of increased strength to resist the effects of repeatedly applied stresses.

The invention consists in a wire spoke in.

which the end of the spoke is slightly bentsay to about 4c5 to the center line of the straight partof the spoke and is also bent in the opposite direction to such an extent that the center line of the straight portion of the-spoke shall pass through or near the point of intersection of the center line of the slightly bent end with the center line of the bearing portion of the flange.

Referring now to the accompanying drawings :--Figure l is'a View showing a spoke constructed according to the known manner. Fig. 2 shows a spoke according to the present invention, and Fig. 3 shows a spoke similar to 2, but in which the stem is slightly bent to-increase its elasticity.

In spokes of the known character represented in Fig. -l, the-center line XX oithe straight portion a, of thespoke passes considerably beyond theintersection of the center line BB of the bent portion, 0 with the center line D-D of the bearing surface the point, 0, the

being merely in'the flange. Asthe result of experiment in practice it is found that'while' such the effects of repeatedly applied stresses, yetthey are not entirely satisfactory in this respect. Now if a spoke according to Fig. 1,]in addition to beingset at the end to say 45, be bent backwards as shown in, Figs. 2 and 3, so that the center line X-X. of the straight part, a, passes through or near 0 the point of intersection of the center line B-B with the center line D l), it is found that very marked advantages are obtained in the matter of give or elasticity for .a given stress, thus rendering the spoke better able to stand shocks. Further by this construction in whichthe center line X- X of the straight portion, 0;, passes through or near pull of the portion, a, is taken direct by, that part of the bent portendency to deform at the bend is removed.

'It will be obvious that this principleot bending the metal of the spoke may be em tended to the shank, a, as shown in Fig. 3 in which the spoke is;so arranged as to its bending that thet niean' center line of the .stemf'passes as beforethrough the point, 0. 4

The spoke constructed accordin to Fig. 3 possesses a great amount of e asticity or give and is thus able to withstand shocks.

The bends shown in Fig. 3 may be either waves in the plane of the paper as shown in the drawings or in the form of a corkscrew or spiral and the bendsniay be either considerably sharper or flatter than illustrated,

the height oflthe waves shown in Fig. 3

chosen to illustrate one con venient form. v i

By experiment it has been found that very marked advantages are obtained by setting the ends of the spokes in the manner.

shown in Figs. 2 and 3. The set portion of the spoke may be made somewhat thicker than the straight portion, a, if desired as shown in the figures, and the end of the bent portion is formed with a head in the usual or any convenient manner.

Having thus described my invention what I claim is new and desire to secure by Letters Patent is a l. A spoke in which the oint 0t intersection of the axis out the hes. portion endthe center line of the flange engaging portion In testimony whereof I have signed my of the head lies on the mean center line of name to this specification the presence of 10 the stim pofition. h h th t f t two subscribing witnesses.

2. soemw1c e olnomersection 0 the axis of the he d portion and- JOHN VERNON PUGH the center of the flange engaging rtion of .Witnesses: 1 the head lies on the mean center me of the I BERTRAM H. MATTHEWS,- stem and in which the stemis bent. I GEORGE I. Bmnons. 

